[programmertote]

One doesn't need to wait 6 years with H1B to apply for green card. S/he needs to get his/her employer to agree on sponsoring the green card and the process can start whenever. My employer agreed to apply for green card in the second year of my H1B. I fortunately am not from one of those countries (China and India) with long wait for green card, so I got mine in a little less than 4 years (in fact, my case took a bit longer than usual, but COVID-related delay was a factor and the lawfirm, Fragomen, messing up a step in my application process was another factor in such a delay).

[Sophie_Alcorn]

Yes, this is correct. Some employers are even willing to start the green card process before the H-1B is even selected in the lottery. But whether that's a good idea depends on the specifics of each employee's travel plans and current immigration status.